Mozilla Firefox, SeaMonkey, and Thunderbird are prone to a URI-spoofing vulnerability.

Attackers may exploit this issue to display arbitrary content with a spoofed URI. Successfully exploiting this issue may aid in phishing attacks.

Note: This issue was previously discussed in BID 55856 (Mozilla Firefox/Thunderbird/SeaMonkey MFSA 2012-74 through -87 Multiple Vulnerabilities), but has been moved to its own record to better document it.